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Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
package org.python.compiler;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.Map;
import java.util.Map.Entry;
import org.objectweb.asm.Type;
import org.python.core.Py;
import org.python.core.PyException;
import org.python.core.PyMethod;
import org.python.core.PyObject;
import org.python.core.PyProxy;
import org.python.core.PyReflectedFunction;
import org.python.util.Generic;
/*
* Various constants and methods for generating Proxy code
*/
public class ProxyCodeHelpers {
public static final int tBoolean=0;
public static final int tByte=1;
public static final int tShort=2;
public static final int tInteger=3;
public static final int tLong=4;
public static final int tFloat=5;
public static final int tDouble=6;
public static final int tCharacter=7;
public static final int tVoid=8;
public static final int tOther=9;
public static final int tNone=10;
public static Map, Integer> types = fillTypes();
public static Map, Integer> fillTypes() {
Map, Integer> typeMap = Generic.map();
typeMap.put(Boolean.TYPE, tBoolean);
typeMap.put(Byte.TYPE, tByte);
typeMap.put(Short.TYPE, tShort);
typeMap.put(Integer.TYPE, tInteger);
typeMap.put(Long.TYPE, tLong);
typeMap.put(Float.TYPE, tFloat);
typeMap.put(Double.TYPE, tDouble);
typeMap.put(Character.TYPE, tCharacter);
typeMap.put(Void.TYPE, tVoid);
return typeMap;
}
public static int getType(Class c) {
if (c == null) {
return tNone;
}
Object i = types.get(c);
if (i == null) {
return tOther;
} else {
return ((Integer)i);
}
}
/**
* Retrieves name from the PyObject in proxy if it's defined in
* Python. This is a specialized helper function for internal PyProxy use.
*/
public static PyObject findPython(PyProxy proxy, String name) {
PyObject o = proxy._getPyInstance();
if (o == null) {
proxy.__initProxy__(new Object[0]);
o = proxy._getPyInstance();
}
PyObject ret = o.__findattr__(name);
if (ret instanceof PyMethod) {
PyMethod meth = ((PyMethod)ret);
if (meth.__func__ instanceof PyReflectedFunction) {
PyReflectedFunction func = (PyReflectedFunction)meth.__func__;
if (func.nargs > 0 && proxy.getClass() == func.argslist[0].declaringClass) {
// This function is the default return for the proxy type if the Python instance
// hasn't returned something of its own from __findattr__, so do the standard
// Java call on this
return null;
}
}
}
Py.setSystemState(proxy._getPySystemState());
return ret;
}
public static PyException notImplementedAbstractMethod(
PyProxy proxy, String name, String superClass) {
PyObject o = proxy._getPyInstance();
String msg = String.format(
"'%.200s' object does not implement abstract method '%.200s' from '%.200s'",
o.getType().fastGetName(),
name,
superClass);
return Py.NotImplementedError(msg);
}
public static String mapClass(Class c) {
String name = c.getName();
int index = name.indexOf(".");
if (index == -1) {
return name;
}
StringBuffer buf = new StringBuffer(name.length());
int last_index = 0;
while (index != -1) {
buf.append(name.substring(last_index, index));
buf.append("/");
last_index = index+1;
index = name.indexOf(".", last_index);
}
buf.append(name.substring(last_index, name.length()));
return buf.toString();
}
public static String mapType(Class type) {
if (type.isArray())
return "["+mapType(type.getComponentType());
switch (getType(type)) {
case tByte: return "B";
case tCharacter: return "C";
case tDouble: return "D";
case tFloat: return "F";
case tInteger: return "I";
case tLong: return "J";
case tShort: return "S";
case tBoolean: return "Z";
case tVoid: return "V";
default:
return "L"+mapClass(type)+";";
}
}
public static String makeSig(Class ret, Class... sig) {
String[] mapped = new String[sig.length];
for (int i = 0; i < mapped.length; i++) {
mapped[i] = mapType(sig[i]);
}
return makeSig(mapType(ret), mapped);
}
public static String makeSig(String returnType, String... parameterTypes) {
StringBuilder buf = new StringBuilder("(");
for (String param : parameterTypes) {
buf.append(param);
}
return buf.append(')').append(returnType).toString();
}
public static void doReturn(Code code, Class type) throws Exception {
switch (getType(type)) {
case tNone:
break;
case tCharacter:
case tBoolean:
case tByte:
case tShort:
case tInteger:
code.ireturn();
break;
case tLong:
code.lreturn();
break;
case tFloat:
code.freturn();
break;
case tDouble:
code.dreturn();
break;
case tVoid:
code.return_();
break;
default:
code.areturn();
break;
}
}
public static void doNullReturn(Code code, Class type) throws Exception {
switch (getType(type)) {
case tNone:
break;
case tCharacter:
case tBoolean:
case tByte:
case tShort:
case tInteger:
code.iconst_0();
code.ireturn();
break;
case tLong:
code.lconst_0();
code.lreturn();
break;
case tFloat:
code.fconst_0();
code.freturn();
break;
case tDouble:
code.dconst_0();
code.dreturn();
break;
case tVoid:
code.return_();
break;
default:
code.aconst_null();
code.areturn();
break;
}
}
public static String[] mapClasses(Class[] classes) {
String[] mapped = new String[classes.length];
for (int i = 0; i < mapped.length; i++) {
mapped[i] = mapClass(classes[i]);
}
return mapped;
}
public static String[] mapExceptions(Class[] classes) {
String[] exceptionTypes = new String[classes.length];
for (int i = 0; i < classes.length; i++) {
// Exceptions are represented by their internal names
exceptionTypes[i] = Type.getType(classes[i]).getInternalName();
}
return exceptionTypes;
}
public static class MethodDescr {
public final Class returnType;
public final String name;
public final Class[] parameters;
public final Class[] exceptions;
public final Map methodAnnotations;
public final Map[] parameterAnnotations;
public MethodDescr(Method m) {
this(m.getName(), m.getReturnType(), m.getParameterTypes(), m.getExceptionTypes(), null, null);
}
public MethodDescr(String name,
Class returnType,
Class[] parameters,
Class[] exceptions) {
this.name = name;
this.returnType = returnType;
this.parameters = parameters;
this.exceptions = exceptions;
this.methodAnnotations = null;
this.parameterAnnotations = null;
}
public MethodDescr(String name,
Class returnType,
Class[] parameters,
Class[] exceptions,
Map methodAnnotations,
Map[] parameterAnnotations) {
this.name = name;
this.returnType = returnType;
this.parameters = parameters;
this.exceptions = exceptions;
this.methodAnnotations = methodAnnotations;
this.parameterAnnotations = parameterAnnotations;
}
@Override
public int hashCode() {
return name.hashCode() + parameters.length;
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof MethodDescr)) {
return false;
}
MethodDescr oDescr = (MethodDescr)obj;
if (!name.equals(oDescr.name) || parameters.length != oDescr.parameters.length) {
return false;
}
for (int i = 0; i < parameters.length; i++) {
if (!parameters[i].equals(oDescr.parameters[i])) {
return false;
}
}
return true;
}
}
public static class ConstructorDescr extends MethodDescr {
public ConstructorDescr(Constructor cons) {
this(cons.getParameterTypes(), cons.getExceptionTypes());
}
public ConstructorDescr(Class[] parameters, Class[] exceptions) {
super("", Void.TYPE, parameters, exceptions);
}
}
public static class AnnotationDescr {
public final Class annotation;
public final Map fields;
public AnnotationDescr(Classannotation) {
this.annotation = annotation;
this.fields = null;
}
public AnnotationDescr(Classannotation, Map fields) {
this.annotation = annotation;
this.fields = fields;
}
public boolean hasFields() {
if (fields == null) {
return false;
}
return true;
}
public String getName() {
return mapType(annotation);
}
public Map getFields() {
return fields;
}
@Override
public int hashCode() {
if (hasFields()) {
int hash = annotation.hashCode();
for (Entry field: fields.entrySet()) {
hash += field.getKey().hashCode() + field.getValue().hashCode();
}
return hash;
} else {
return annotation.hashCode();
}
}
}
}